Fast Object Database for Java - with JPA/JDO support

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javax.persistence.metamodel.CollectionAttribute

,Collection>, Bindable, PluralAttribute,E> Instances of the type CollectionAttribute ... > getBindableJavaType() Return the Java type of the represented object. Return the Java type of the represented object. If the bindable type of the object is PLURAL_ATTRIBUTE, the Java element type is returned
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javax.persistence.metamodel.PluralAttribute

of the type PluralAttribute represent persistent collection-valued attributes. Since: JPA 2.0 Class getBindableJavaType() Return the Java type of the represented object. Return the Java type of the represented object. If the bindable type of the object is PLURAL_ATTRIBUTE, the Java element type
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javax.persistence.metamodel.ListAttribute

>>, Bindable, PluralAttribute,E> Instances of the type ListAttribute represent persistent javax.util.List-valued attributes. Since: JPA 2.0 Class getBindableJavaType() Return the Java type of the represented object. Return the Java type of the represented object. If the bindable type
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javax.persistence.metamodel.SingularAttribute

>, Bindable Instances of the type SingularAttribute represents persistent single-valued properties or fields. Since: JPA 2.0 Class getBindableJavaType() Return the Java type of the represented object. Return the Java type of the represented object. If the bindable type of the object is PLURAL
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javax.persistence.criteria.Subquery

Returns: selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast ... a new expression object. This method does not cause type conversion: the runtime type is not changed. Warning: may result in a runtime failure. Parameters: type - intended type of the expression Returns
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javax.jdo.Query

There are two namespaces in queries. Type names have their own namespace that is separate from the namespace for fields, variables and parameters. The method setClass introduces the name of the candidate class in the type namespace. The method declareImports introduces the names of the imported class or interface types
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combined index not used

.properties.doubleValue FROM Action a WHERE a.type = 0 and a.subType = 3 and a.state = 3 and a.endDate ... .linkedObjects.objectNameUpper = 'SETUP' and a.objectsInCharge.linkedObjects.type = 1 ... retaining only results that satisfy: (a.type=0). Step 2: Process ObjectNode (v$1) instances
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GROUP BY and HAVING clauses

interface provides methods for building aggregate expressions: count, countDistinct - return a long type ... representing the sum of values. avg - returns a double type expression representing the average
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JPA Lifecycle Events

of the lifecycle event. The argument can have any type that matches the actual value (e.g. in the code above, Object can be replaced by a more specific type). The listener class should be stateless
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Step 5: Add a JSP Page

"> Name: type="text" name="name" /> type="submit" value="Add

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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